Game Gun: fun, but will get you killed in Quake

Look at this video of the Game Gun. The concept is simple: stuck a display on a “gun” and use a motion sensor and voila, you get pseudo realistic action. I kind of like the idea, and may be that would be great for Point Blank (hum… may be not), but I know for a fact that you will get slammed at Quake or any of these First Person Shooter (FPS) designed for the mouse+keyboard. Still, there must be a good game out there for it… ideas anyone?